AccessTockenUrl is null

Question

AccessTockenUrl is null how to Login google without webview 

 

public class ServerInfo

{

public static Uri AuthorizationEndpoint = new Uri("http://xamuath.azurewebsites.net/oauth/authorize");

public static Uri TokenEndpoint = new Uri("http://xamuath.azurewebsites.net/oauth/token");

public static Uri ApiEndpoint = new Uri("http://xamuath.azurewebsites.net/api/whoami");

public static Uri RedirectionEndpoint = new Uri("http://www.xamarin.com");

public static string ClientId = "129890716-tlcae38h8k4va7so4kq25theeiml1iv8.apps.googleusercontent.com";

public static string ClientSecret = "Qt3jLqJn65034gfacHB3AX";

}

 

public void Button_Login_Google(object sender, EventArgs e)

{

OAuth2Authenticator authenticator = new OAuth2Authenticator

(

ServerInfo.ClientId,

Scope,

ServerInfo.AuthorizationEndpoint,

ServerInfo.RedirectionEndpoint,

null,

isUsingNativeUI: native_ui

);

authenticator.Completed += OnAuthCompleted;

authenticator.Error += OnAuthError;

var presenter = new Xamarin.Auth.Presenters.OAuthLoginPresenter();

presenter.Login(authenticator);

return;

}